None of the Praetorian missions run thru Ouro change your alignment. (Praetorian or otherwise)
Probably wouldn't be a stretch to make the mission available earlier via Ouro since I think there are a couple non-praetorian missions that are available.
Well, maybe not.
Lost and Found (12.01) from Montague is available at level 10 normally, but is only available under the level 50 division via Ouro if you have already done it.
I just checked with a level 24 that had done it and it's listed to repeat. My level 33 that hasn't done does not have it available.
iirc, if my Praetorian did the escape mission, they had it available via Ouro there as well.
Only reason to repeat it would be to chat with the various people you interacted with via the Preatoria missions, and those appear depending on which arcs you go on, Loyalist, Resistance, or if you go to Paragon or the Rogue Isles.